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Star in the constellation Centaurus From Wikipedia, the free encyclopedia
HD 119921 is a single,[4] white-hued star in the southern constellation of Centaurus. it has the Bayer designation z Centauri. This is faintly visible to the naked eye, having an apparent visual magnitude of 5.15.[2] It forms a wide double star with a faint, magnitude 12.50 visual companion, which is located at an angular separation of 27.20″ as of 2010.[11] HD 119921 is moving closer to us with a heliocentric radial velocity of around −10 km/s,[6] and is currently located some 420±10 light year from the Sun. At that distance, the visual magnitude of this star is diminished by 0.15 from extinction due to interstellar dust.[7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 13h 46m 56.35149s[1] |
Declination | –36° 15′ 06.9563″[1] |
Apparent magnitude (V) | 5.15[2] |
Characteristics | |
Spectral type | A0 V[3][4] or B9.5 III-n[5] |
Astrometry | |
Radial velocity (Rv) | −9.8±2.8[6] km/s |
Proper motion (μ) | RA: −13.293[1] mas/yr Dec.: −11.115[1] mas/yr |
Parallax (π) | 7.7881 ± 0.2382 mas[1] |
Distance | 420 ± 10 ly (128 ± 4 pc) |
Absolute magnitude (MV) | 0.93[7] |
Details | |
Luminosity | 125.24[8] L☉ |
Temperature | 8,801[8] K |
Rotational velocity (v sin i) | 220[9] km/s |
Age | 337[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A0 V, per Houk (1979).[3] However, Gray & Garrison (1987) have it classed as B9.5 III-n, suggesting it is a more evolved giant star.[5] HD 119921 is spinning rapidly with a projected rotational velocity of 220 km/s.[9] The star is radiating around 125 times the Sun's luminosity from its photosphere at an effective temperature of 8,801 K.[8]
In 1983, Molaro et al. reported the presence of super-ionized elements (triple-ionized carbon and silicon) in the far ultraviolet spectrum of HD 119921. These anomalous features are not normally detected from a star in this temperature range.[12] Instead, these blue-shifted absorption features may originate in the local interstellar medium.[9]
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